diff --git a/R/extendr-wrappers.R b/R/extendr-wrappers.R
index c7c3b3552..a2ae2137f 100755
--- a/R/extendr-wrappers.R
+++ b/R/extendr-wrappers.R
@@ -50,6 +50,8 @@ dummy_compile <- function(template_path) .Call(wrap__dummy_compile, template_pat
 is_cargo_installed <- function() .Call(wrap__is_cargo_installed)
 
 #' Fits the model at the given path to the data at the given path using the provided parameters.
+#' NOTE: This is an internal function and should not be called directly.
+#' See [PM_model()] `$fit()` method for arguments.
 #' @param model_path Path to the compiled model file.
 #' @param data Path to the data file.
 #' @param params List of fitting parameters.
diff --git a/man/fit.Rd b/man/fit.Rd
index 443b982f7..f6bd1cf36 100644
--- a/man/fit.Rd
+++ b/man/fit.Rd
@@ -2,7 +2,9 @@
 % Please edit documentation in R/extendr-wrappers.R
 \name{fit}
 \alias{fit}
-\title{Fits the model at the given path to the data at the given path using the provided parameters.}
+\title{Fits the model at the given path to the data at the given path using the provided parameters.
+NOTE: This is an internal function and should not be called directly.
+See \link{PM_model} \verb{$fit()} method for arguments.}
 \usage{
 fit(model_path, data, params, output_path, kind)
 }
@@ -22,4 +24,6 @@ Result of the fitting process.
 }
 \description{
 Fits the model at the given path to the data at the given path using the provided parameters.
+NOTE: This is an internal function and should not be called directly.
+See \link{PM_model} \verb{$fit()} method for arguments.
 }
diff --git a/src/rust/src/lib.rs b/src/rust/src/lib.rs
index d280ceff1..99f28f790 100755
--- a/src/rust/src/lib.rs
+++ b/src/rust/src/lib.rs
@@ -117,8 +117,9 @@ fn simulate_all(
     rows.into_dataframe().unwrap()
 }
 
-
 /// Fits the model at the given path to the data at the given path using the provided parameters.
+/// #' NOTE: This is an internal function and should not be called directly.
+/// #' See [PM_model()] `$fit()` method for arguments.
 /// @param model_path Path to the compiled model file.
 /// @param data Path to the data file.
 /// @param params List of fitting parameters.
@@ -307,4 +308,4 @@ extendr_module! {
 // To generate the exported function in R, run the following command:
 // rextendr::document()
 // Optional: reload Pmetrics
-// devtools::load_all()
\ No newline at end of file
+// devtools::load_all()