diff --git a/bash_it.sh b/bash_it.sh
index bda3407e..59c6ed8e 100755
--- a/bash_it.sh
+++ b/bash_it.sh
@@ -15,8 +15,11 @@ fi
 # shellcheck disable=SC1090
 source "${BASH_IT}"/vendor/github.com/erichs/composure/composure.sh
 
-# We need to load logging module first as well in order to be able to log
-# shellcheck source=./lib/log.bash
+# Declare our end-of-main finishing hook
+declare -a _bash_it_library_finalize_hook
+
+# We need to load logging module early in order to be able to log
+# shellcheck source-path=SCRIPTDIR/lib
 source "${BASH_IT}/lib/log.bash"
 
 # We can only log it now
@@ -148,3 +151,8 @@ if ! _command_exists reload && [[ -n "${BASH_IT_RELOAD_LEGACY:-}" ]]; then
 			;;
 	esac
 fi
+
+for _bash_it_library_finalize_f in "${_bash_it_library_finalize_hook[@]:-}"; do
+	eval "${_bash_it_library_finalize_f?}" # Use `eval` to achieve the same behavior as `$PROMPT_COMMAND`.
+done
+unset "${!_bash_it_library_finalize_@}"
diff --git a/docs/development.rst b/docs/development.rst
index cd5c59b0..4742e971 100644
--- a/docs/development.rst
+++ b/docs/development.rst
@@ -147,6 +147,11 @@ Plugin Disable Callbacks
 Plugins can define a function that will be called when the plugin is being disabled.
 The callback name should be ``{PLUGIN_NAME}_on_disable``\ , you can see ``gitstatus`` for usage example.
 
+Library Finalization Callback
+-----------------------------
+
+Specifically for Bash-it library code, e.g. in the `lib` subdirectory, a hook is available to run some code at the very end of the main loader script after all other code has been loaded. For example, `lib/theme` uses `_bash_it_library_finalize_hook+=('_bash_it_appearance_scm_init')` to add a function to be called after all plugins have been loaded.
+
 Using the pre-commit hook
 -------------------------
 
diff --git a/themes/base.theme.bash b/themes/base.theme.bash
index f9f5190d..94e6befd 100644
--- a/themes/base.theme.bash
+++ b/themes/base.theme.bash
@@ -106,7 +106,7 @@ function _bash_it_appearance_scm_init() {
 		fi
 	fi
 }
-_bash_it_appearance_scm_init
+_bash_it_library_finalize_hook+=('_bash_it_appearance_scm_init')
 
 function scm {
 	if [[ "$SCM_CHECK" = false ]]; then