diff --git a/src/main.cc b/src/main.cc
index 81ad37bc..79a55965 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -93,6 +93,10 @@ void register_env_vars()
             "timestamp", false,
             [](StringView name, const Context& context) -> String
             { return to_string(context.buffer().timestamp()); }
+        }, {
+            "curr_history_id", false,
+            [](StringView name, const Context& context) -> String
+            { return to_string(context.buffer().current_history_id()); }
         }, {
             "selection", false,
             [](StringView name, const Context& context)