diff --git a/R/error_conversion.R b/R/error_conversion.R
index e03b973f3..940dba05a 100644
--- a/R/error_conversion.R
+++ b/R/error_conversion.R
@@ -132,3 +132,34 @@ raw_result = function(expr) {
     }
   )
 }
+
+
+#' Check Rust feature flag
+#'
+#' Raise error if the feature is not enabled
+#' @noRd
+#' @param feature_name name of feature to check
+#' @inheritParams unwrap
+#' @return TRUE invisibly if the feature is enabled
+#' @keywords internal
+#' @examples
+#' tryCatch(
+#'   check_feature("simd", "in example"),
+#'   error = \(e) cat(as.character(e))
+#' )
+#' tryCatch(
+#'   check_feature("rpolars_debug_print", "in example"),
+#'   error = \(e) cat(as.character(e))
+#' )
+check_feature = function(feature_name, context = NULL, call = sys.call(1L)) {
+  if (!pl$polars_info()$features[[feature_name]]) {
+  Err_plain(
+ "\nFeature '", feature_name, "' is not enabled.\n",
+ "Please check the documentation about installation\n",
+ "and re-install with the feature enabled.\n"
+ ) |>
+ unwrap(context, call)
+  }
+
+  invisible(TRUE)
+}
diff --git a/R/expr__string.R b/R/expr__string.R
index f4770a2b9..f1690b77b 100644
--- a/R/expr__string.R
+++ b/R/expr__string.R
@@ -188,6 +188,8 @@ ExprStr_to_lowercase = function() {
 #'   tryCatch(f(), error = as.character)
 #' }
 ExprStr_to_titlecase = function() {
+  check_feature("full_features", "in $to_titlecase():")
+
   .pr$Expr$str_to_titlecase(self) |>
     unwrap("in $to_titlecase():")
 }
diff --git a/R/sql.R b/R/sql.R
index b532aa85b..3f1f1ac54 100644
--- a/R/sql.R
+++ b/R/sql.R
@@ -36,6 +36,8 @@ RPolarsSQLContext
 #' ctx = pl$SQLContext(mtcars = mtcars)
 #' ctx
 pl$SQLContext = function(...) {
+  check_feature("sql", "in $SQLContext()")
+
   self = .pr$RPolarsSQLContext$new()
   lazyframes = list(...)