diff --git a/docs/Project.toml b/docs/Project.toml
index 9daa8ec1..98316bb8 100644
--- a/docs/Project.toml
+++ b/docs/Project.toml
@@ -3,6 +3,7 @@ CairoMakie = "13f3f980-e62b-5c42-98c6-ff1f3baf88f0"
 Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"
 DocumenterCitations = "daee34ce-89f3-4625-b898-19384cb65244"
 FFTW = "7a1cc6ca-52ef-59f5-83cd-3a7055c09341"
+FourierFlows = "2aec4490-903f-5c70-9b11-9bed06a700e1"
 JLD2 = "033835bb-8acc-5ee8-8aae-3f567f8a3819"
 Literate = "98b081ad-f1c9-55d3-8b20-4c87d4299306"
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
diff --git a/docs/src/references.bib b/docs/src/references.bib
index e2224632..c21c6cdc 100644
--- a/docs/src/references.bib
+++ b/docs/src/references.bib
@@ -55,3 +55,26 @@ @techreport{Carpenter-Kennedy-1994
   address = {NASA Langley Research Center, Hampton, VA},
   url = {https://ntrs.nasa.gov/api/citations/19940028444/downloads/19940028444.pdf}
 }
+
+@article{Toner-Tu,
+  title = {Long-Range Order in a Two-Dimensional Dynamical $\mathrm{XY}$ Model: How Birds Fly Together},
+  author = {Toner, John and Tu, Yuhai},
+  journal = {Phys. Rev. Lett.},
+  volume = {75},
+  issue = {23},
+  pages = {4326--4329},
+  numpages = {0},
+  year = {1995},
+  month = {Dec},
+  publisher = {American Physical Society},
+  doi = {10.1103/PhysRevLett.75.4326},
+  url = {https://link.aps.org/doi/10.1103/PhysRevLett.75.4326}
+}
+
+@book{chaikin-Lubensky, 
+    place={Cambridge}, 
+    title={Principles of Condensed Matter Physics}, 
+    DOI={10.1017/CBO9780511813467}, 
+    publisher={Cambridge University Press}, 
+    author={Chaikin, P. M. and Lubensky, T. C.}, year={1995}
+}
diff --git a/src/XYAdvection.jl b/src/XYAdvection.jl
index a0718614..2a8708d7 100644
--- a/src/XYAdvection.jl
+++ b/src/XYAdvection.jl
@@ -246,6 +246,7 @@ module XYAdvection
       file = jldopen(filepath)
       px = irfft(file[string("snapshots/sol/", titr)][:,:, 1], nx)
       py = irfft(file[string("snapshots/sol/", titr)][:,:, 2], nx)
+      close(file)
       return px,py
    end
    ############################################################################################################