diff --git a/doc/Doxyfile.in b/doc/Doxyfile.in
index 6d83977a..4373dfe5 100644
--- a/doc/Doxyfile.in
+++ b/doc/Doxyfile.in
@@ -794,6 +794,7 @@ INPUT                  = @top_srcdir@/src/ \
                          @top_srcdir@/tagmanager/src/tm_source_file.h \
                          @top_srcdir@/tagmanager/src/tm_workspace.c \
                          @top_srcdir@/tagmanager/src/tm_workspace.h \
+                         @top_srcdir@/tagmanager/src/tm_tag.h \
                          @top_srcdir@/tagmanager/src/tm_parser.h
 
 # This tag can be used to specify the character encoding of the source files
diff --git a/doc/Makefile.am b/doc/Makefile.am
index 3c57960c..46553b32 100644
--- a/doc/Makefile.am
+++ b/doc/Makefile.am
@@ -97,7 +97,9 @@ doxygen_sources = \
 	$(top_srcdir)/src/*.[ch] \
 	$(top_srcdir)/plugins/geanyplugin.h \
 	$(top_srcdir)/tagmanager/src/tm_source_file.[ch] \
-	$(top_srcdir)/tagmanager/src/tm_workspace.[ch]
+	$(top_srcdir)/tagmanager/src/tm_workspace.[ch] \
+	$(top_srcdir)/tagmanager/src/tm_tag.h \
+	$(top_srcdir)/tagmanager/src/tm_parser.h
 
 Doxyfile.stamp: Doxyfile $(doxygen_sources)
 	$(AM_V_GEN)$(DOXYGEN) Doxyfile && echo "" > $@