diff --git a/doc/api/mainpage.dox b/doc/api/mainpage.dox
index aaaaf2a..cb8fe25 100644
--- a/doc/api/mainpage.dox
+++ b/doc/api/mainpage.dox
@@ -34,7 +34,7 @@ process them.
 The two libraries are independently and usually a process uses either `libei` or
 `libeis` but not both.
 
-@section sec-ei EI - the client implementation
+@section sec-ei 🥚 EI - the client implementation
 
 The `libei` library is the component used by clients that want to emulate
 input events. It provides the required methods to connect to an EIS
@@ -43,7 +43,7 @@ input.
 
 The API documentation for EI is available at @ref libei.
 
-@section sec-eis EIS - the server implementation
+@section sec-eis 🍦 EIS - the server implementation
 
 The `libeis` library is the component used by processes that handle input
 events. It provides the required methods to set up seats and input devices,
@@ -52,7 +52,7 @@ clients.
 
 The API documentation for EI is available at @ref libeis.
 
-@section sec-oeffis Oeffis - a XDG RemoteDesktop portal wrapper API
+@section sec-oeffis 🚌 Oeffis - a XDG RemoteDesktop portal wrapper API
 
 liboeffis is a helper library for applications that do not want to or cannot
 interact with the XDG RemoteDesktop DBus portal directly. It abstracts the
diff --git a/src/libei.h b/src/libei.h
index f19d9e3..ca1514b 100644
--- a/src/libei.h
+++ b/src/libei.h
@@ -33,7 +33,7 @@ extern "C" {
 #include <stddef.h>
 
 /**
- * @defgroup libei EI - The client API
+ * @defgroup libei 🥚 EI - The client API
  *
  * libei is the client-side module. This API should be used by processes
  * that need to emulate devices or capture logical events from existing devices.
diff --git a/src/libeis.h b/src/libeis.h
index 0f7239c..eb013a7 100644
--- a/src/libeis.h
+++ b/src/libeis.h
@@ -34,7 +34,7 @@ extern "C" {
 #include <stdint.h>
 
 /**
- * @defgroup libeis EIS - The server API
+ * @defgroup libeis 🍦 EIS - The server API
  *
  * libeis is the server-side module. This API should be used by processes
  * that have control over input devices, e.g. Wayland compositors.
diff --git a/src/liboeffis.h b/src/liboeffis.h
index d4996cf..4fec5b8 100644
--- a/src/liboeffis.h
+++ b/src/liboeffis.h
@@ -33,7 +33,7 @@ extern "C" {
 #include <stddef.h>
 
 /**
- * @addtogroup oeffis liboeffis - An XDG RemoteDesktop portal wrapper API
+ * @addtogroup oeffis 🚌 liboeffis - An XDG RemoteDesktop portal wrapper API
  *
  * liboeffis is a helper library for applications that do not want to or cannot
  * interact with the XDG RemoteDesktop DBus portal directly.