diff --git a/src/cthulhu.py b/src/cthulhu.py
index c7fc998..e416abd 100644
--- a/src/cthulhu.py
+++ b/src/cthulhu.py
@@ -28,6 +28,7 @@ import gi
 gi.require_version("Atspi", "2.0")
 from gi.repository import Atspi
 import os
+import shutil
 import signal
 import subprocess
 import sys
@@ -233,6 +234,42 @@ def inGraphicalDesktop():
 
     return display is not None
 
+def getSessionType():
+    sessionType = (os.environ.get("XDG_SESSION_TYPE") or "").strip().lower()
+    if sessionType:
+        return sessionType
+    if os.environ.get("WAYLAND_DISPLAY"):
+        return "wayland"
+    if os.environ.get("DISPLAY"):
+        return "x11"
+    return "unknown"
+
+def getXServerVendor():
+    display = os.environ.get("DISPLAY")
+    if not display:
+        return None
+
+    xdpyinfoPath = shutil.which("xdpyinfo")
+    if not xdpyinfoPath:
+        return None
+
+    try:
+        result = subprocess.run(
+            [xdpyinfoPath, "-display", display],
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            timeout=1,
+        )
+    except Exception:
+        return None
+
+    for line in result.stdout.splitlines():
+        if "vendor string:" in line:
+            return line.split("vendor string:", 1)[1].strip()
+    return None
+
 def otherCthulhus():
     """Returns the pid of any other instances of Cthulhu owned by this user."""
 
@@ -285,6 +322,29 @@ def main():
         print(messages.CLI_NO_DESKTOP_ERROR)
         return 1
 
+    sessionType = getSessionType()
+    sessionDetails = []
+    xdgSessionType = os.environ.get("XDG_SESSION_TYPE")
+    if xdgSessionType:
+        sessionDetails.append(f"XDG_SESSION_TYPE={xdgSessionType}")
+    if sessionType == "wayland":
+        waylandDisplay = os.environ.get("WAYLAND_DISPLAY")
+        if waylandDisplay:
+            sessionDetails.append(f"WAYLAND_DISPLAY={waylandDisplay}")
+    elif sessionType == "x11":
+        display = os.environ.get("DISPLAY")
+        if display:
+            sessionDetails.append(f"DISPLAY={display}")
+        vendor = getXServerVendor()
+        if vendor:
+            sessionDetails.append(f"X server vendor={vendor}")
+
+    if sessionDetails:
+        msg = f"INFO: Session: {sessionType} ({', '.join(sessionDetails)})"
+    else:
+        msg = f"INFO: Session: {sessionType}"
+    debug.printMessage(debug.LEVEL_INFO, msg, True)
+
     debug.printMessage(debug.LEVEL_INFO, "INFO: Preparing to launch.", True)
 
     from cthulhu import cthulhu
diff --git a/src/cthulhu/cthulhu_bin.py.in b/src/cthulhu/cthulhu_bin.py.in
index 316c8a6..f2b1ca5 100644
--- a/src/cthulhu/cthulhu_bin.py.in
+++ b/src/cthulhu/cthulhu_bin.py.in
@@ -28,6 +28,7 @@ import gi
 gi.require_version("Atspi", "2.0")
 from gi.repository import Atspi
 import os
+import shutil
 import signal
 import subprocess
 import sys
@@ -191,6 +192,42 @@ def inGraphicalDesktop():
 
     return display is not None
 
+def getSessionType():
+    sessionType = (os.environ.get("XDG_SESSION_TYPE") or "").strip().lower()
+    if sessionType:
+        return sessionType
+    if os.environ.get("WAYLAND_DISPLAY"):
+        return "wayland"
+    if os.environ.get("DISPLAY"):
+        return "x11"
+    return "unknown"
+
+def getXServerVendor():
+    display = os.environ.get("DISPLAY")
+    if not display:
+        return None
+
+    xdpyinfoPath = shutil.which("xdpyinfo")
+    if not xdpyinfoPath:
+        return None
+
+    try:
+        result = subprocess.run(
+            [xdpyinfoPath, "-display", display],
+            check=True,
+            stdout=subprocess.PIPE,
+            stderr=subprocess.PIPE,
+            text=True,
+            timeout=1,
+        )
+    except Exception:
+        return None
+
+    for line in result.stdout.splitlines():
+        if "vendor string:" in line:
+            return line.split("vendor string:", 1)[1].strip()
+    return None
+
 def otherCthulhus():
     """Returns the pid of any other instances of Cthulhu owned by this user."""
 
@@ -243,6 +280,29 @@ def main():
         print(messages.CLI_NO_DESKTOP_ERROR)
         return 1
 
+    sessionType = getSessionType()
+    sessionDetails = []
+    xdgSessionType = os.environ.get("XDG_SESSION_TYPE")
+    if xdgSessionType:
+        sessionDetails.append(f"XDG_SESSION_TYPE={xdgSessionType}")
+    if sessionType == "wayland":
+        waylandDisplay = os.environ.get("WAYLAND_DISPLAY")
+        if waylandDisplay:
+            sessionDetails.append(f"WAYLAND_DISPLAY={waylandDisplay}")
+    elif sessionType == "x11":
+        display = os.environ.get("DISPLAY")
+        if display:
+            sessionDetails.append(f"DISPLAY={display}")
+        vendor = getXServerVendor()
+        if vendor:
+            sessionDetails.append(f"X server vendor={vendor}")
+
+    if sessionDetails:
+        msg = f"INFO: Session: {sessionType} ({', '.join(sessionDetails)})"
+    else:
+        msg = f"INFO: Session: {sessionType}"
+    debug.printMessage(debug.LEVEL_INFO, msg, True)
+
     debug.printMessage(debug.LEVEL_INFO, "INFO: Preparing to launch.", True)
 
     from cthulhu import cthulhu