diff --git a/crates/ra_syntax/src/ast/expr_extensions.rs b/crates/ra_syntax/src/ast/expr_extensions.rs
index e609e02dc7..c91dd2bf4b 100644
--- a/crates/ra_syntax/src/ast/expr_extensions.rs
+++ b/crates/ra_syntax/src/ast/expr_extensions.rs
@@ -322,6 +322,11 @@ impl ast::Literal {
 
         match token.kind() {
             INT_NUMBER => {
+                // FYI: there was a bug here previously, thus an if statement here is necessary.
+                // The lexer treated e.g. `1f64` as an integer literal. See
+                // https://github.com/rust-analyzer/rust-analyzer/issues/1592
+                // and the comments on the linked PR.
+
                 let text = token.text();
 
                 if let suffix @ Some(_) = Self::find_suffix(&text, &FLOAT_SUFFIXES) {